Advisory for the month of August 2017

A. For transplanting kharif onion seedlings

If kharif transplanting has not been done yet, it may be done now as per the practices given below.

1.Field should be ploughed and disked properly to eliminate debris and soil clods.

2.Apply FYM 15 t/ha or poultry manure 7.5 t/ha or vermicompost 7.5 t/ha at the time of last ploughing and level the field properly prior to bed preparation.

3.Adopt broad bed furrows (BBF) of 15 cm height and 120 cm top width with 45 cm furrow. This will help to drain the excess water through furrow and in reducing anthracnose disease.

4.BBF method is suitable for drip and sprinkler irrigation.

5.For drip irrigation, each BBF should have two drip laterals (16 mm size) at 60 cm with inbuilt emitters. Distance between two inbuilt emitters should be around 30-50 cm and discharge flow rate of 4 L/hr is advised.

6.For sprinkler the distance between laterals (20 mm) of micro sprinkler should be 6 m with a discharge rate of 135 L/hr.

7.Chemical fertilizers @ 75:40:40 kg N, P2O5, K2O per hectare need to be applied. Also apply 30 kg sulphur/ha in soils having available sulphur level above 25 kg/ha while 45 kg sulphur/ha for soils having sulphur content below 25 kg/ha. Nitrogen @ 25 kg and full dose of P2O5 and K2O and sulphur needs to be applied at the time of planting. Remaining dose of N needs to be applied in two equal splits at 30 days and 45 days after transplanting.

8.If onion is grown with drip system, application of 25 kg nitrogen as basal dose at the time of transplanting and remaining nitrogen in six equal splits through drip irrigation should be applied up to 60 days from transplanting at 10 days interval. P, K and S should be applied as basal at the time of transplanting.

9.Biofertilizers @ 5 kg/ha each Azospirillum and phosphorus solublizing bacteria are recommended along with inorganic fertilizers as basal dose.

10.Apply oxyflurofen @ 23.5% EC (1.5-2.0 ml/L)/ pendimethalin @ 30% EC (3.5-4ml/L) before transplanting or at the time of transplanting.

11.Seedlings of 35-40 days old should be transplanted at a spacing of 15×10 cm (15 cm between the rows and 10 cm between plants).

12.Proper care should be taken while selecting seedlings for transplanting. Over and under aged seedlings should be avoided. Top ⅓rd of seedlings should be cut before transplanting.

13.The onion seedling should be transplanted after dipping roots in carbendazim solution (0.1%) to reduce the incidence of fungal diseases.

14.Irrigation at the time of transplanting and three days after transplanting is advised for good establishment.

 
B. For standing kharif onion crop

1.If there is a continuous rainfall, the excess water should be drained out properly to avoid anthracnose incidence.

2.First top dressing of nitrogen @ 25 kg/ha may be applied at 30 days after transplanting.

3.If nitrogen deficiency (yellowing of leaves) appears in the field due to nitrogen leaching, foliar application of urea @ 10 g/L is recommended to overcome nitrogen deficiency.

4.If there is a continuous rainfall for three days, relative humidity is more than 85% or cloudy condition, the farmers are advised to give first prophylactic spray with benomyl @ 0.2% to control anthracnose disease.

5.Second prophylactic spray with methomyl (0.8 g/L) along with mancozeb (2.5 g/L) after 15 days of benomyl spray is recommended. This will take care of foliar diseases and thrips incidence.

 
C. For raising late kharif onion nursery

Following points need to be considered while preparing late kharif nursery.
1.About 0.05 hectare nursery bed area and 5-7 kg of seeds is recommended for getting seedlings to transplant in one hectare.

2.Deep ploughing is recommended for exposing the insect pupae and weed seeds to sunlight.

3.The debris of previous crops, weeds and stones should be removed before bed preparation.

4.Apply half ton of well decomposed farmyard manure in 0.05 ha.

5.Raised beds of 10-15 cm height, 1 m width and length as per convenience need to be prepared.

6.Application of pre-emergence herbicide pendimethalin @ 0.2% is recommended to control weeds in nursery.

7.Seeds should be treated with carbendazim @ 1-2 g/kg seed before sowing to avoid soil borne diseases.

8.Application of Trichoderma viride @ 1250 g/ha is also recommended to manage damping off and raise healthy seedlings.

9.Apply 4:1:1 kg NPK/500 m2 before seed sowing.

10.Seeds should be sown in lines at 50 mm to 75 mm apart. After sowing, the seeds should be covered with fine powdered farmyard manure or compost followed by light watering. Drip or sprinkler irrigation is recommended.

11.Hand weeding needs to be done 20 days after sowing.

12.Apply 2 kg N /500 m2 after hand weeding.

13.Drenching of metalaxyl @ 0.2 % is recommended to control soil borne diseases at 10-15 days after sowing. If foliar disease incidence is observed, foliar application of mancozeb/tricyclozole/hexaconazole @ (0.1%) is recommended.

14.When the severity of thrips infestation is high, foliar application of fipronil/ profenophos @ 1 ml/L is recommended.


D. For stored rabi onion and garlic bulbs

1.Monitor stored bulbs regularly for sprouting and rotting. Rotted and bruised bulbs if any should be removed immediately. Make sure that ventilation is proper.

2.Onion bulbs should be spread properly with heap height up to 4-5 feet only.

3.Garlic bulbs with leaves should be stored in ventilated storage structure by hanging or in circular heaps tapering towards top.

 
Note: Profenophos, fipronil and methomyl are recommended only when the thrips damage is visible. Metalaxyl, benomyl, mancozeb, hexaconazole and tricyclozole are recommended only when the disease incidence is visible.